Extractor gets same data while the website changes data


I have two issues in extracting market gainers from https://finance.yahoo.com/gainers

  1. when market opens at 6:30am, the extractor failed to get data for a while. I couldn’t get the data when I needed for 30 min more or less.
  2. once it gets data, it has same data all the time even after a few hours.

Could you help me?
Attached file has one for extracted data and the other is website data.